在牛粪中添加水稻秸秆进行厌氧共发酵产沼气,考察接种量、发酵温度、原料固体含量对发酵产沼气效果的影响。结果表明:厌氧发酵接种是必需的,随着接种量增多产气量增大,适宜的接种比例为10%(质量比);常温、中温(36℃)和高温(55℃)3种温...在牛粪中添加水稻秸秆进行厌氧共发酵产沼气,考察接种量、发酵温度、原料固体含量对发酵产沼气效果的影响。结果表明:厌氧发酵接种是必需的,随着接种量增多产气量增大,适宜的接种比例为10%(质量比);常温、中温(36℃)和高温(55℃)3种温度条件下,中高温发酵产气效果较好,中温更适合发酵;在20%、10%、5%(质量比)3种固体含量条件下,固体含量越大产气量波动越大,10%固体含量产气效果最好,发酵前30天累积产气量可达4 710 m L,容积产气率为0.313 m^3/(m^3·d)。本试验所得的结果可为牛粪水稻秸秆厌氧共发酵的实际应用提供参考。展开更多
The purpose of this study was to investigate the potential of high-solids anaerobic mono-digestion of riverbank grass under thermophilic conditions, focusing on the effects of the strength and the amount of inoculum. ...The purpose of this study was to investigate the potential of high-solids anaerobic mono-digestion of riverbank grass under thermophilic conditions, focusing on the effects of the strength and the amount of inoculum. Ensiled grass was inoculated with three different inocula; inoculum from liquid anaerobic digester（LI）, inoculum from dry anaerobic digester（DI）, and mixture of LI and DI（MI）, at feedstock-to-inoculum ratio（FIR） of 1, 2 and 4. The ensiling process of riverbank grass reduced moisture content（p 〉 0.05）, while the hemicellulose content was significantly increased from 30.88% to 35.15%（p 〈 0.05）, on dry matter basis. The highest methane production was at an FIR of 2 with MI（167 L/kg VSadded）,which was significantly higher（p 〈 0.05） than with DI, but not significant compared to LI（p 〉 0.05）. At an FIR of 4, digesters inoculated with LI and DI failed to produce methane,whereas 135 LCH4/kg VSaddedwas obtained with MI. The kinetic studies showed that at an FIR of 1 with LI and MI, the inoculum had less of effects on the hydrolysis rate constant（0.269 day-1and 0.245 day-1） and methane production（135 versus 149 L/kg VSadded）; rather,it affected the lag phase. In a thermophilic HS-AD of riverbank grass, the mixture of inoculum with low and high total solids content（TS） helps increase the TS of inoculum and digestion process. An FIR of 2 was deducted to be the limit for a better startup time and higher volumetric productivity of methane.展开更多
文摘在牛粪中添加水稻秸秆进行厌氧共发酵产沼气,考察接种量、发酵温度、原料固体含量对发酵产沼气效果的影响。结果表明:厌氧发酵接种是必需的,随着接种量增多产气量增大,适宜的接种比例为10%(质量比);常温、中温(36℃)和高温(55℃)3种温度条件下,中高温发酵产气效果较好,中温更适合发酵;在20%、10%、5%(质量比)3种固体含量条件下,固体含量越大产气量波动越大,10%固体含量产气效果最好,发酵前30天累积产气量可达4 710 m L,容积产气率为0.313 m^3/(m^3·d)。本试验所得的结果可为牛粪水稻秸秆厌氧共发酵的实际应用提供参考。
文摘The purpose of this study was to investigate the potential of high-solids anaerobic mono-digestion of riverbank grass under thermophilic conditions, focusing on the effects of the strength and the amount of inoculum. Ensiled grass was inoculated with three different inocula; inoculum from liquid anaerobic digester（LI）, inoculum from dry anaerobic digester（DI）, and mixture of LI and DI（MI）, at feedstock-to-inoculum ratio（FIR） of 1, 2 and 4. The ensiling process of riverbank grass reduced moisture content（p 〉 0.05）, while the hemicellulose content was significantly increased from 30.88% to 35.15%（p 〈 0.05）, on dry matter basis. The highest methane production was at an FIR of 2 with MI（167 L/kg VSadded）,which was significantly higher（p 〈 0.05） than with DI, but not significant compared to LI（p 〉 0.05）. At an FIR of 4, digesters inoculated with LI and DI failed to produce methane,whereas 135 LCH4/kg VSaddedwas obtained with MI. The kinetic studies showed that at an FIR of 1 with LI and MI, the inoculum had less of effects on the hydrolysis rate constant（0.269 day-1and 0.245 day-1） and methane production（135 versus 149 L/kg VSadded）; rather,it affected the lag phase. In a thermophilic HS-AD of riverbank grass, the mixture of inoculum with low and high total solids content（TS） helps increase the TS of inoculum and digestion process. An FIR of 2 was deducted to be the limit for a better startup time and higher volumetric productivity of methane.
